Light projector



Nov. 24, 1942. A. J. PEREIRA LIGHT PROJECTOR Filed Nov. as. 1941 m a HMP 9 4 a g dflIQZZZb Pengz'ra m6 v & 'ZM

Patented Nov. 24, 1942 UNITED STATES PATENT OFFICE Antonio J. Pereira,Oakland, Calif.

Application November 26, 1941, Serial No. 420,561

1 Claim.

This invention relates to electric lamps and has for its purpose toprovide an improved light projector.

An important object of my invention is to provide a light projector ofnovel construction wherein the electric bulb constituting the source ofillumination is mounted in the center of a flat reflector containedwithin an elongated housing having its inner walls coated with alight-absorbing material, the arrangement being such that the light fromthe bulb falling upon the reflector brightly illuminates the reflectorand causes a beam to be projected from the lamp housing.

Another object of my invention is to provide in a light projector of theabove character, means for slidably mounting the reflector so that thereflector together with the bulb may be moved longitudinally of the lamphousing to vary the character of the beam produced by the light.

Other objects and advantages will be apparent from the followingdetailed description of a preferred embodiment of my invention,reference being had to the annexed drawing in which:

Figure 1 is a longitudinal vertical cross-sectional view through a lightprojector;

Figure 2 is a transverse vertical cross-sectional view of the projectortaken on the line 2-2 of Fig. 1; and

Figure 3 is an enlarged detail cross-sectional view through thereflector showing more clearly the socket associated therewith formounting the electric bulb.

Referring to the drawing, in the cross-sectional view of Fig. 1 is showna light projector comprising an elongated housing I supported upon apost 2, a pin connection 3 being provided between the post and housing,including a clamping nut 3a, whereby the projector may be tilted todifierent positions.

The housing I may be made of light sheet metal rolled into generallycylindrical shape, the upper side of the housing being offset slightlyto form an arched roof 4 extending from a point located a short distanceinwardly from the forward end of the housing to the closed rear end ofthe housing. Vents 5 extend in rows along opposite sides of the archedroof to afford ventilation for the interior of the projector.

The forward end of the housing is closed by a lens 6 while its oppositeend is closed by an end wall I. Mounted for slidable adjustment withinthe housing is a flat reflector 8, such as a glass mirror, correspondingin size to the inside diameter of the housing but having a tongue 8aextending part way up into the space provided by the arched roof 4.Overlying and bonded to the back of the reflector is a backing plate 9,this backing plate being centrally formed with a rearwardly-directed cupID in which is secured a socket H for receiving an electric bulb l2.

A hollow tube [3 is fastened to the bottom of the cup l0 and extendshorizontally outward through an opening in the end wall 1 of the housingwhere its end is provided with a knob 14. Conductors I5 extend throughthe tube and at one end form an electrical connection with the lampsocket and at their other end are provided with a plug-in l6, by whichthey may be connected with .a source of current. The bulb I2 is adaptedto be screwed into the socket H and to extend through a clearanceopening provided in the center of the reflector. This bulb is preferablyof the mushroom type having a silvered center as indicated at l8. Theinterior of the housing is painted black, as indicated at I9, so as toabsorb the stray light rays. The end wall I of the housing is centrallyand rearwardly offset to present a pocket 20 for receiving the cup l0when the reflector is retracted to its fullest extent.

In the operation of my light projector, the electric light bulb I2 isinserted in the socket l0 and the plug-in I6 is connected to a source ofcurrent. The operator then by grasping knob l4 moves the tube l3longitudinally and with it the reflector 8. Moving the reflector towardthe lens increases the dispersion of the rays emerging from the housing,while moving the reflector away from the lens reduces such dispersion,the rays reflected against the interiorly black coated wall of thehousing being absorbed thereby. The bright reflection from the polishedsurface of the mirror 8 is further enhanced by the dark background ofthe light housing.

By moving the projector about its pivotal connection with the post 2,its beam may be directed in difierent directions.

Manifestly the invention is capable of being embodied in forms otherthan that described above, which is to be regarded as exemplary ratherthan as restrictive of the invention, without departing from the spiritof the invention as defined in the following claim.

I claim:

A light projector comprising a generally cylindrical elongated housingcoated black completely I upon its interior, a lens closing one end ofthe housing and a wall closing the opposite end or the housing, areflector including a flat generallycircular mirror disposed within thehousing parallel to the lens and corresponding closely to the bulb ashort distance in front of the reflecting face of the mirror, a tubeassociated with said reflector and extending through the end wall of thehousing to permit manual sliding adjustment of the reflector lengthwiseof the housing, and flexible conductors electrically connected to thesocket and extending rearwardly through the tube.

ANTONIO J. PEREIRA.

